I bought these two pairs of Levi's 501's from a national chain. I noticed that the leather patch is different from all the other Levi's 501's I own. The red ink on them is an unusually bright shade and there's less detail in the printing. I have also noticed that they're missing the registered trade mark on the leather patch.

One of the pairs is made in Mexico and the other Egypt. The pair made in Mexico has a color code that I'd never seen before: 00501-XHVYY. The other pair did not have a label with such a code. Apart from the leather patch, everything else about the jeans appear authentic.